Making Model Airplanes

Look at sentence 2 again.

(2) One reason is that I learn about the past.

Which sentence could BEST follow and support sentence 2?

Look at sentence 9 agian.

(9) Lastly, I paints all the details to match the real airplane.

How should this sentence be changed?

Look at sentence 12 again.

(12) We make a great temm.

How should this sentence be changed?

Look at sentence 13 again.

(13) He teach me about all of the models.

How should this sentence be changed?

Look at these sentences again.

(3) War airplanes are my favorite models.

(4) To build.

(17) It is a lot of fun!

Which sentence is NOT a complete sentence?